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Remember that when you use a function in the WHERE clause, the database won t use an indexed scan, even if an index exists on the FIRST_NAME column. Because of this, you should avoid using functions in the WHERE clause. Some databases support creating function-based indexes and you can use them if needed. Just be aware that the function-based indexes may not be portable. For our example, you could consider storing the names in uppercase instead of using the JPQL Upper function. Reducing round-trips to the database If your query retrieves a lot of entities, that means a lot of rows are retrieved from the database, and this translates into multiple round-trips between your application and the database. Some JDBC drivers provide facilities to reduce the number of round-trips to the database by setting the number of rows to be prefetched in the middle tier while a result set is being populated. This improves performance of queries that retrieve a large number of rows. You can pass the JDBC fetch size as a vendor-specific @QueryHint in either a named query or dynamic query as follows. If you re using TopLink or Hibernate, you can use toplink.jdbc.fetch-size or org.hibernate.fetchSize, respectively. The following code snippet demonstrates using @QueryHint for Hibernate:

Now things really start to hop. We ll add 23 new forms to the application in this chapter. Most of them implement basic code editors, similar to the UserName.vb and GroupName.vb files we built in 11. Other forms exist to provide additional support for these record editors. I won t reprint anything I ve gone over before, but I ll point out some interesting new code on our way through each of these 23 forms. If you re following along in the Before version of this chapter s project, you will need to enable each form as you encounter it. To do this, select the file in the Solution Explorer window, and change the file s Build Action property (in the Properties panel) from None to Compile.

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Here, you can see another aspect of the power of OOP: you can make radical changes to a program, and if you re careful, things will still work when you re done. Of course, you can do that with procedural programming, but your chances of success are usually higher with OOP.

{ static int hitCount = 0; hitCount++; return (hitCount); } // global hit count initialized at startup to 0 // increment global hit count variable // return updated hit count

public event InputEventHandler InputEvent;

We re also doing something clever(ish) with the Fill color of our Rectangles i. We defined an array of colors earlier, and we re cycling through that collection, assigning the colors in order to each of the Rectangles. We could have assigned a color when we created the Rectangle; but, if we removed a value from the collection or inserted a new value in the middle, the colors would be wrong. All that s left is for us to add a call at the bottom of the GraphHolder s UserControl_Loaded to pass in the collection of NameValuePairs.

Private Sub BackMenuItems_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles BackMenu1.Click, ..., BackMenu10.Click ' ----- One of the back menu items was clicked. Dim whichItem As Integer Dim counter As Integer Dim scanHistory As ItemLookupHistory ' ----- Determine the clicked item. whichItem = CInt(DigitsOnly(CType(sender, _ System.Windows.Forms.ToolStripMenuItem).Name)) If (whichItem >= LookupHistorySet.Count) Then Return ' ----- Get rid of the in-between items. For counter = 1 To whichItem LookupHistorySet.Pop( ) Next counter ' ----- Perform a lookup as requested. scanHistory = LookupHistorySet.Peek If (PerformLookup(scanHistory.LookupType, _ scanHistory.LookupData, False) = False) Then Return RefreshBackButtons( ) End Sub

You may end up refactoring your utility methods into these types of utility classes:

have created, the RSS viewer allows us to read the feeds from our desktops without visiting the individual websites that host the feeds.

4.1 4.2 4.3 4.4 4.5 Creating a thread 50 Starting threads 52 Ending threads 54 Determining a thread s status 63 Summary 68

This is a standard toolbar that will appear almost unchanged in any iUI program that you create. Every toolbar should have a pageTitle line B. Most will also have a backButton line C, unless your app contains no subsidiary pages. The button line D which is what we called an action button in section 5.1 is the most optional of the three, and will only appear when you have some action that you want a user to be able to take. A few of these elements bear additional discussion. First, notice that the pageTitle and backButton lines do not contain any content. This is because iUI s Javascript automatically fills them. The pageTitle will be filled with the title of the element that s currently selected. The backButton will be filled by the title of the previous element when you move forward a page (and won t be used until then).

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